From my research it looks like one more mass imported tag that should not have been ever imported and just pollutes tag lists
Yes, editing to remove it will require editing objects carrying it which will increase version number.
(alternatives include removing it manually over course of multiple centuries, adding it to discardable tags or keeping it forever - personally I consider those as clearly inferior)
See NHD:RESOLUTION | Keys | OpenStreetMap Taginfo and NHD:Resolution | Keys | OpenStreetMap Taginfo for taginfo overview